Year	Percent
1970	-0.00467
1972	0.00033
1973	-0.00139
1974	0.00019
1975	0.00205
1976	0.00131
1977	0.00117
1979	0.0004
1980	-0.00031
1981	0.00026
1982	0.00058
1983	-0.00011
1984	0.00029
1985	0.09144
1986	0.15045
1987	0.19373
1988	0.25527
1989	0.30446
1990	0.32498
1991	0.41597
1992	0.43007
1993	0.79586
1994	2.47974
1995	0.87745
1996	0.64542
1997	0.55153
1998	0.53944
1999	1.65681
2000	1.39709
2001	0.52133
2002	0.53285
2003	0.733
2004	1.09619
2005	1.73256
2006	1.97703
2007	3.07378